1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(couch_httpd_external).
-export([handle_external_req/2, handle_external_req/3]).
-export([send_external_response/2, json_req_obj/2]).
-export([default_or_content_type/2, parse_external_response/1]).
-import(couch_httpd,[send_error/4]).
-include("couch_db.hrl").
% handle_external_req/2
% for the old type of config usage:
% _external = {couch_httpd_external, handle_external_req}
% with urls like
% /db/_external/action/design/name
handle_external_req(#httpd{
path_parts=[_DbName, _External, UrlName | _Path]
}=HttpReq, Db) ->
process_external_req(HttpReq, Db, UrlName);
handle_external_req(#httpd{path_parts=[_, _]}=Req, _Db) ->
send_error(Req, 404, <<"external_server_error">>, <<"No server name specified.">>);
handle_external_req(Req, _) ->
send_error(Req, 404, <<"external_server_error">>, <<"Broken assumption">>).
% handle_external_req/3
% for this type of config usage:
% _action = {couch_httpd_external, handle_external_req, <<"action">>}
% with urls like
% /db/_action/design/name
handle_external_req(HttpReq, Db, Name) ->
process_external_req(HttpReq, Db, Name).
process_external_req(HttpReq, Db, Name) ->
Response = couch_external_manager:execute(binary_to_list(Name),
json_req_obj(HttpReq, Db)),
case Response of
{unknown_external_server, Msg} ->
send_error(HttpReq, 404, <<"external_server_error">>, Msg);
_ ->
send_external_response(HttpReq, Response)
end.
json_req_obj(#httpd{mochi_req=Req,
method=Verb,
path_parts=Path,
req_body=ReqBody
}, Db) ->
Body = case ReqBody of
undefined -> Req:recv_body();
Else -> Else
end,
ParsedForm = case Req:get_primary_header_value("content-type") of
"application/x-www-form-urlencoded" ++ _ ->
mochiweb_util:parse_qs(Body);
_ ->
[]
end,
Headers = Req:get(headers),
Hlist = mochiweb_headers:to_list(Headers),
{ok, Info} = couch_db:get_db_info(Db),
% add headers...
{[{<<"info">>, {Info}},
{<<"verb">>, Verb},
{<<"path">>, Path},
{<<"query">>, to_json_terms(Req:parse_qs())},
{<<"headers">>, to_json_terms(Hlist)},
{<<"body">>, Body},
{<<"peer">>, ?l2b(Req:get(peer))},
{<<"form">>, to_json_terms(ParsedForm)},
{<<"cookie">>, to_json_terms(Req:parse_cookie())},
{<<"userCtx">>, couch_util:json_user_ctx(Db)}]}.
to_json_terms(Data) ->
to_json_terms(Data, []).
to_json_terms([], Acc) ->
{lists:reverse(Acc)};
to_json_terms([{Key, Value} | Rest], Acc) when is_atom(Key) ->
to_json_terms(Rest, [{list_to_binary(atom_to_list(Key)), list_to_binary(Value)} | Acc]);
to_json_terms([{Key, Value} | Rest], Acc) ->
to_json_terms(Rest, [{list_to_binary(Key), list_to_binary(Value)} | Acc]).
send_external_response(#httpd{mochi_req=MochiReq}=Req, Response) ->
#extern_resp_args{
code = Code,
data = Data,
ctype = CType,
headers = Headers
} = parse_external_response(Response),
couch_httpd:log_request(Req, Code),
Resp = MochiReq:respond({Code,
default_or_content_type(CType, Headers ++ couch_httpd:server_header()), Data}),
{ok, Resp}.
parse_external_response({Response}) ->
lists:foldl(fun({Key,Value}, Args) ->
case {Key, Value} of
{"", _} ->
Args;
{<<"code">>, Value} ->
Args#extern_resp_args{code=Value};
{<<"stop">>, true} ->
Args#extern_resp_args{stop=true};
{<<"json">>, Value} ->
Args#extern_resp_args{
data=?JSON_ENCODE(Value),
ctype="application/json"};
{<<"body">>, Value} ->
Args#extern_resp_args{data=Value, ctype="text/html; charset=utf-8"};
{<<"base64">>, Value} ->
Args#extern_resp_args{
data=couch_util:decodeBase64(Value),
ctype="application/binary"
};
{<<"headers">>, {Headers}} ->
NewHeaders = lists:map(fun({Header, HVal}) ->
{binary_to_list(Header), binary_to_list(HVal)}
end, Headers),
Args#extern_resp_args{headers=NewHeaders};
_ -> % unknown key
Msg = lists:flatten(io_lib:format("Invalid data from external server: ~p", [{Key, Value}])),
throw({external_response_error, Msg})
end
end, #extern_resp_args{}, Response).
default_or_content_type(DefaultContentType, Headers) ->
IsContentType = fun({X, _}) -> string:to_lower(X) == "content-type" end,
case lists:any(IsContentType, Headers) of
false ->
[{"Content-Type", DefaultContentType} | Headers];
true ->
Headers
end.
|
